Micrometer height-gage.



PATBNTED SEPT. 12, 1905.

G. D. CLARK. MIGROMETER HEIGHT GAGE.

APPLICATION FILED 00T. 19. 1904.

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y UNITED STATES PATENT OFFICE. .l

MICROMETER HEIGHT-GAGE.

Specification of' Letters Patent.

Patented Sept. 12, 1905.

Application filed October 19, 1904. Serial No. 229.083.

Be it known that l, (inmunes l). (Thank, a citizen of the United States,residing at rlorrington, county ofv llitchlield, State of (lonnectieut,have invented a new and useful Microineter Height-Hage, of which thefollowing is a specification.

My invention has for its object to provide a micrometer hei ght-gageadapted for general use, and especially adapted for use on metalworkingmachines ygs planers, shapers, and milling-machines to determine thefinished thickness of' a piece of metal to be operated upon, which maybe either a large piece of metal or a key or gib, in thousandths of aninch.

Heretofore the custom in machine-shops has been to set the tools ofplaners and other metal-working machines by the use of standard-sizeblocks. This method of determining the height of a tool is seriouslyinconvenient, as it requires that a number of standard-size blocks bekept handy and for tine adjustments requires building up with thinpieces of metal. My present invention enables me to adjust the tool of'a planer or other metal-working machine to any desired height toproduce a given thickness of the piece of metal to be operated upon inthousandths of an inch, one., two, and three inch extension-pins beingprovided for use in determining the thickness of large pieces of metal.

With the above-stated and other objects in view 1 have devised the novelmicrometer height-gage which I will now describe, referring to theaccompanying drawings, forming part of this speciiication, and usingreference characters to indicate the several parts.

Figure l is an elevation illustrating the use of the novel tool insetting in thousandths of an inch the tool of a metal-planer without theuse of an extension-pin; Fig. 2, a perspective of my novel height-gageas in use, illustrating the mode of adjustment; Fig. 3, a view, partlyin elevation and partly in section, illustrating the construction of thetool and also illustrating the use of an extension-pin; Fig. 4, anelevation of the barrel detached;' Fig. 5, an elevation, partly brokenaway, of the gage plate and sleeve detached; and Figs. 6 and 7 areelevations of extension-pins detached.

20 denotes the base, and 21 the shank, of my novel height-gage, whichLis provided with a shoulder 22. As shown in Fig. 1 and indicated in Fig.2, said base 2O is of a length and width to enable the device as a wholeto stand rscale-sleeve 27. 'lhe innersleeve is provided at its upper endwith a huh 29, to which the outer sleeve is rigidly secured hy a drivelit and below the hub with a thread 28. The upper end of thescale-sleeve is externally rcduced in diameter, and the lower end of theouter sleeve is internally enlarged in diameter, so that the two sleevesare secured together bya frietional engagement, as at 30, the lower endof'the outer sleeve resting against a shoulder 40 on the scale-sleeve.This frictional engagement of the scale-sleeve with the outer sleeve issufieiently tight so that the parts are immovable relatively to eachother under all the ordinary conditions of use, but at the same time itis permitted to adjust the scale-sleeve relatively to the outer sleevein setting up the tool and also to compensate for wear in use. At thelower end of the scale-sleeve is ascale 41, which is graduated from oneto twenty five, indicating thousandths of an inch, a complete rotationof the barrel acting to move the gage-plate and gage-sleeve upward ordownward twentyfive thousandths-that is, one-fortieth-of an inch, aswill be more fully explained.

31 denotes a gage-plate which is provided with a threaded hole 42 toreceive the threaded Shanks 43 of extension-pins 37, with a hole 44 toreceive a guide-pin 23, which extends upward from-the base, and with anopening 33, corresponding in diameter with the internal diameter of agage-sleeve 32, which extends upward from the gage-plate. At the upperend of the gage-sleeve is an internal screw-thread, which engages thread28 on the inner sleeve. The gage-sleeve is provided with a scale 45,which is graduated to fortieths of an inch-that is, the spacebetweengraduation-marks is twenty-five thousandths of an inch. Scale 45is also shown as4 graduated to both eighths and tenths ot' an inch, thefigures at the rightin Fig. 5 indicating eighths of an vinch and thefigures at the left tenths of an inch.

The upper end of shank 21 is provided with a groove 46, lwhich receivesa lug 47l on a check-washer 34, with an external thread 48, which isengaged by a locking-nut 35,'and with a threaded hole49, which isengaged by a locking-screw 36.-

In Fig. 1, 39 indicatesthe bed of a planer or other metal-working tool,and 50 the ling-tool of a metal-planer.

'lhe operation will be obvious to any person skilled in the use ol'mechanics tools. lt will be noted in Fig. 3 that. the shank extendsslightly above the locking-nut, leaving the latter sullie-ient play tolock and release the barrel. ln setting up the tool the gage-plate andgage-sleeve are placed in position, as shown, and then the barrel isplaced over the shank, the interna-l thread on the gage-sleeve enga-gingthread 2301i the inner sleevel and the lower end of the inner sleeveresting on shoulder 22ml the shank. '.l.`he check-washer is then placedover the upper end of the shank, lug 47 engaging the groove in the shank.to prevent rotation of the washer, which rests upon the top of thebarrel. Locking-nut 35 is then turned to place, so that it may bear uponthe check-washer, and locking-screw 36 is turned to place to securelyretain the parts in position and limit the backward movement of thelocking-nut. the gage in use, the operator turns the locking-nutbackward, which releases the barrel, leaving it free to be rotated toraise or lower the gage-sleeve and gage-plate, thousandths of an inch,as already explained, being indicated by the scale on scale-sleeve 27and fortieths, tenths, and eighths of an inch being indicated by scale45 on the gage sleeve.. lhe operator rotates the barrel in eitherdirection as may be required to raise or lower the gage-plate to anyrequired height, as indicated by the scales. The distance between thebed 39 of a planer or other machine-tool on which the base of the gagerests with the device in upright position and the top of the gage-plateis indicated in eighths, tenths, and fortieths of an inch byscale-sleeve 27in connection with scale 45 on the scale-sleeve, andthousandths of an inch are indicated by scale Veu t- -tl on thegage-sleeve in connection with the l vertical line of scale 45. When thegageplate has been placed at the exact height in thousandths of an inchto which it is desired to finish a piece of metal, the gage-plate islocked in position by turning down lockingnut 35 upon the check-washerand forcing the latter against the top of the barrel, thereby lockingthe barrel and gage-sleeve carrying the gage-plate rigidly at anyadjustment at which it may have been placed. In order to readjust thegage-plate, it is simply necessary to turn the lockingnut backwardslightly, whichI leaves the barrel free to be rotated again to raise orlower the gage-plate, as may be required. Having adjusted the gage-platetothe required height, it may be placed under the cutter of a planer orother metal-working machine, as shown in Fig. 1, and the cutter thenlowered' until it just engages the gage-plate, as in Fig. 1.

. With the device in position as shown in Fig. 1 the height of thecutter may be carefully adjusted without reference loany necessity forholding the. gage in upright position, because the base-plate 24) willitsellI insure the standing ol' the gage in upright position. 'lhereforethe cutter 5l) of the planer may be. carefully brought. down until itjust touches the. upper surl'ace of the gage-plate 3l', after which thegage may be slid out ol posit-ion. 'lhe eutterol' a nnuehine-tool whenadjusted in this manner will linsh a piece ol metal to the exactthickness to which the gage-plate of the height-gage was adjusted.

W hen it is desired to set a, machine-tool to linish a relatively thickpiece of metal, an extension-pin one, two, or more inches in height maybe used (see Fig. 3) and the gage-plate raised sufficiently to place thetop of the cxtension-pin at the exact height to which it is desired tofinish a piece of metal, measuring fractions of an inch by means ofscales 41 and 45 on the gage-sleeve and scale-sleeve, as before. When anextension-pin is used, the tool of a metal-working machine is lowered tojust engage the top of the extension-pix instead of the gage-plate.

i-he base 20 and the gageplate 31 (or an extension-pin 37, carried bythe plate 31) constitute spacing members the outer faces of which areemployed to determine the distance between the bed of a vplaner and theworking face orA edge of the cutting-tool. These outer faces in theembodiment of the invention illustrated comprise the under surface ofthe base-plate 2O and' the upper surface of the adjustable member, whichmay be the upper face of the gage-plate 31 or the upper end of anextension-pin 37, carried by the latter. To utilize the device for thepurpose stated, the scale 4 5 is of course so formed on the gage-sleeve32 as to indicate the measurement of the distance between the outerfaces of the spacing members described in order to determine the heightof the tool above the bed of the planer.

When it is required to use the gage for gib and key fitting, thegage-plate is turned down toward the base, the base and gage-plateplaced in the slot, and then the gage-plate is adjusted to measure thewidth of the slot in thousandths of an inch by rotating the barrel asbefore, after which the gage is placed on 'the bed or table of a planer,shapenor millingmachine and the cutting-tool turned down until it justengages the gage-plate, as before. A tool set in this manner will givethe finishing cut to a gib or key and cause it to tit the slot with anyrequired degree of closeness.

Having thus described my invention, I claim- 1. In a micrometerheight-gage, the combination with a shank having a shoulder 22, and agage-sleeve adaptedto slide on said shank and having an internalscrew-thread, said shank and sleeve carrying the spacing members of abarrel adapted to be rotated on f the shank and comp-rising an iexternally- .threaded inner sleeve which bears against the shoulderland.iseng'aged by th'ethread on the gage-sleeve and an outerl sleevebetween which and having an internal screw-thread and a gage-plate, thesaid base-plate having a fiat.

under surface andbeing of a size and shape to support the device inupright position on a bed, of a barrel adapted to be rotated on theshank and comprising inner and outer sleeves, the inner sleeve beingexternally threaded for engagement with thegage-sleeve which isinclosedbetween the inner and outer sleeves, the said gage-sleeve havingascaleto indicate the distance between the outer faces of the lbase-plate andgage-plate. f 3. In a micrometer height-gage, the combination with ashank and base-plate, 'and a gage-sleeve having a laterally-extendingplate#` and adapted to slide on said shank and havingan internalscrew-thread, and a plurality of extension-pins adapted to beinterchangeably secured to the gage-plate in upright position, for thepurpose set forth, of a barrel adapted to be rotated on the shank andcomprising inner and outer sleeves, the inner sleeve being externallythreaded Ifor engagement with the gage-sleeve which is inclosed betweenthe inner and outer sleeves, the said gage-sleeve having a scale toindicate the distance between the outer' faces of the base-plate andgage-plate.

4. In amicrometer height-gage, the combination with a base-plate havinga flat under surface and bein-g of a size and shape to support thedevice in upright position on a bed, said plate having a shank and aguide-pin extending therefrom, of an internally-threaded gage-sleeveadapted to slide on the shank and provided with a plate having a holethrough which the guide-pin passes and a barrel comprising inner andouter sleeves, said inner sleeve being externally threaded to engage thegage-sleeve, and the gage-sleeve being inclosed between the inner andouter sleeves,`

the said gage-sleeve having a scale to indicate the distance between theouter faces of the base-plate and gage-plate.

' 5. In a micrometer height-gage, the combi'- nation with a base vhavinga iat under surface and being of a size and shape to support the devicein upright position on a bed, said base having ashank extendingtherefrom and a gage-sleeve adapted to slide thereon and carrying agage-plate, of a barrel adapted to rotate on the shank and having athreaded engagement with the gage-sleeve whereby the' latterand thegage-plate maybe raised, and lowered, the said gage-sleeve having,r ascale to indicate 'the' distance between the outer faces of the base andgage-plate. A

6. In a. micrometer height-gage,'the combination with a base having ashank extending therefrom',agage-sleeve adapted to slide thereon, agage-'plate extending from the gage.- sleeve and a plurality ofextension-pins adapted to be interchangeably secu red to the gageplatein upright position, of a barrel adapted to rotate on the shank andhaving a threaded engagement with the gage-sleeve whereby the latter andthe gage-plate may be raised and lowered, the said gage-sleeve having ascale to indicate the distance between the outer faces of the base andgage-plate.

`7. In a micrometer height-gage, the combination with a base having afiat under surface and being of a size and shape to support the devicein upright position on a bed, said base having a guide-pin and a shankextending therefrom, a gage-sleeve adapted to slide onthe shank and agage-plate extending from .the gage-sleeve and having a hole through"which the guide-pin passes and a threaded hole for Vengagement byextension-pins, of a barrel adapted to rotate on the shank and having athreaded engagement with the gagesleeve whereby the latter andthegage-plate.

may be raised and lowered, the said gagesleeve having a scale toindicate the distance between the outer faces of the base and gageplate.

' 8. In a micrometer height-gage, the combination with a shank anda-gagesleeve adapted to slide thereon and having an internalscrewthread, of a barrel adapted tobe rotated on the shank andcomprising an externallythreaded inner sleeve which is engaged bythethread on the gage-sleeve, an outer sleeve between which and the innersleeve the gagesleeve isinclosed and a scale-sleeve having a frictionalengagement with the end of the outer sleeve.

9. A'micrometerheight-gage comprising a shank-and a gage-sleeve eachcarrying a projecting member the outer faces of which are IOO IIO

adapted to measure distance, the member projecting9 from the shankhaving a 'flat under surface and being of a size and-shape to'supportthe device in-upright'position on a bed,

a-scale being provided to indicate the distance y between said outerfaces.

10. -In a micrometer height-gage, the com-` bination with va shankhaving a groove atfits upper end and agage-sleeve, of a .barrel hav-.and bearing on the barrel and a locking-nut engaging the shank andadapted to bear on the check-washer whereby the barrel and gage-sleevemaybe locked after adjustment.

11. In a micrometer height-gage; the eomthe'parisere retained in placeand backward bination with a shank and a gage-sleeve adaptmovement; ofthe locking-nut is limited. l 0 ed to slide thereon, of a barrel' havingthread- In testimony whereof] affix my signature in ed engagement withthe gage-sleeve, for the presence of Vtwo witnesses.

A5 4purpose set; forth, a cheek-washer resting onV CHARLES lI). CLARK.

' lhe barrel, a locking-nut engaging theshank and adapted to engage thecheek-washer and a locking-screw engaging the shank whereby Witnesses:

JAMES E. MALLET'rn; MARY C. CAHIR.

